package com.example.wentao.pma.controllers;

import com.example.wentao.pma.dao.StudentRepository;
import com.example.wentao.pma.entities.Student;
import com.example.wentao.pma.services.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.validation.Valid;
import java.util.List;

@Controller
@RequestMapping("students")
public class StudentController {

    @Autowired
    StudentService studentService;
@GetMapping
 public String displayStudents(Model model){
    List<Student> students = studentService.getAll();
    model.addAttribute("students",students);
    return "students/list-students";
}

    @GetMapping("/new")
    public String displayStudentForm(Model model){
        Student aStudent =new Student();
        model.addAttribute("student",aStudent);
        return "students/new-student";
    }
    @PostMapping("/save")
    public String creatStudent(Model model, @Valid Student student, Errors errors) {
    if ( errors.hasErrors()) return "students/new-student";
        //使用student crudRepository保存到数据库
        studentService.save(student);
        return "redirect:students";
    }

    @GetMapping("/update")
    public String displayStudentUpdateForm(@RequestParam("id") long theId ,Model model){

        Student theStudent = studentService.findByStydentId(theId);
        return  "students/new-student";
        }
    @GetMapping("/delete")
    public  String deleteStudent(@RequestParam("id") long theId, Model model){
        Student theStudent = studentService.findByStydentId(theId);
        studentService.delete(theStudent);
        return "redirect:/students";
    }
}
